Obie people can certainly be held accountable for their actions, but they can think what they like.
That is nothing to do with saying an idea, rather than a person, is rubbish.
To give you an example, you might suggest that all Gransnetters should mark the winter solstice by going for a swim in the sea.
I might say what a rubbish idea.
I'm criticising your idea, not you as a person.
You though, are still entitled to your opinion that it's a good idea, and you're equally entitled to go for a swim on December 21st.
Should you get into difficulties because of your action in going in the sea on a very cold day and need to be rescued, others might hold you to account to explain why you took the action you did.
And I'm entitled to think you're bonkers 